The oil used in cooking is different, according to personal taste, everyone's choice is different, at present, rapeseed oil is quite popular in our life, with rapeseed oil fried dishes taste delicious, more and more people choose rapeseed oil. How is the attractive canola oil extracted? Here I take you to understand it! 1, the cleanup of dry rapeseed: rapeseed into the oil plant inevitably with some impurities. Before entering the oil press if you do not remove the sesame seed fruit entrapped in the soil, stems and leaves and other debris, they will not only affect the quality of oil and cake meal, and will adsorb part of the oil, reduce the oil yield. If the sesame fruit sand, metal, hemp rope and other debris, but also cause wear and tear of machine parts, inducing production accidents, affecting the effect of oil extraction. In order to ensure the smooth progress of production, must try to remove impurities, individual high water content of rapeseed, in order to shelling convenience, drying treatment is also very necessary. 2, clean up: clean up a lot of methods, specifically according to the situation of impurities using different methods. If the impurities contained light, such as grass, stems and leaves, etc., you can use the method of wind selection, blowing off the impurities with airflow. If the impurity particles are small, they can be selected to remove the impurities. For some impurities whose size and relative density are similar to those of rapeseed, if they belong to clay lumps, they can be crushed by friction in a clay machine and then removed by screening. If belongs to the iron impurities, you can use electromagnet or permanent magnet line separation. 3, steaming and stir-frying: heat treatment is one of the most important processes in the extraction of oil. Heat treatment includes the wetting and heating of billet, known as steam billet or fry billet in production, steam and fry the billet is called cooked billet. Any raw billet that is pressed after heat treatment is called hot pressing, and those that are not heat treated are called cold pressing. Canola is mainly hot pressed. The effect of heat treatment has a direct impact on the smoothness of the whole oil production process and the high and low oil yield as well as the quality of oil and cake. 4, pressing: Dr. Beijing oil automatic oil press is a small oil press widely used in small oil factories in rural areas, which has a simple structure, high pressure, continuous processing of materials, low labor intensity, and can press a variety of oilseeds. As the round press bar of Beijing Dr. Oil Automatic Oil Press is in the shape of serrated curve and taper, when the material is being pressed, it is pushed and squeezed by the press screw so that the volume of the space between the press screw and the inner wall of the press cage changes constantly; at the back of the press cage, due to the arrangement of the round press bar, the inner wall of the press cage is in the shape of serrated curve, where the material billet is pressed and relaxed alternately, and the structure of the material billet is adjusted constantly to be turned over uniformly to make the oil or the oil that is not extracted or squeezed out of the cage. The structure of the billet is constantly adjusted and evenly turned, so that the oil that has not been pressed out or the billet that has less oil pressed out has more chances to be fully pressed. Therefore, its pressing effect is better.